HOTS Science Primary 4 Energy

A small cup of boiling water (100°C) is poured into a large bathtub filled with water at 30°C. Which of the following is true about the heat energy and temperature?

A Both have the same amount of heat energy because water is the same.
B The cup of water has more heat energy than the bathtub.
C The final temperature will be 130°C.
D The bathtub water has more heat energy than the cup.
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Worked Solution

Step 1: Temperature is a measure of how hot an object is, while heat energy depends on temperature AND mass. Step [2-9]: Although the cup is at a higher temperature, the bathtub has a much larger volume of water. Step [2-9]: The total heat energy in the bathtub is greater because of its massive amount of particles.

Correct answer: The bathtub water has more heat energy than the cup.

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